ICAO Code
Definition
A four-letter code assigned by the International Civil Aviation Organization to identify airports, used primarily in flight plans and air traffic control (e.g., KJFK, KLAX, RKSI).
Related Terms
IATA Code
A three-letter alphanumeric code assigned by the International Air Transport Association to identify airports worldwide. Used on boarding passes, luggage tags, and flight bookings (e.g., JFK, LAX, ICN).
FAA LID
A location identifier assigned by the Federal Aviation Administration to airports in the United States. Often identical to the IATA code but can differ for smaller airports.
Flight Plan
A document filed with air traffic control that specifies the planned route, altitude, speed, and other details of a flight. Required for all IFR flights and recommended for VFR flights.